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2 5 free from water.

Nirn STATES ,ATENT CARL LUOKOTV, OF COLOGNE-DEUTZ, GERMANY.

PROCESS OF PRODUCING PEROXID OF LEAD.

SPECIFICATION forming part Of Letters Patent NO. 626,330, dated June 6,1899.

Application filed December 31, 1897. Serial No. 665,209. (No specimens.)

T (ti/Z whom it may concern.-

Be it known that I, CARL LUcKoW, a subject of the King of Prussia,German Emperor, residing at Oologne-Deutz, Germany, have inventedcertain new and useful Improvements in Processes of Producing Peroxid ofLead by Means of Electrolysis, of which the following is aspecification.

The invention has been patented in Eng- IO land, No. 14,801, datedAugust 6, 1895.

The object of this invention is to produce peroXid of lead by means ofelectrolysis.

It consists,essentially,in the use as electrolyte of a salt of sulfuricacid with sodium,

potassium, or ammonium in mixture with a salt of chloric acid withsodium, potassium, or ammonium in aqueous solution in connection with anodes of lead. The mixture should be about 99.5 per cent. of one of thesalts named above of sulfuric acid and about 0.5

per cent. of one of the salts named above of chloric acid, and theaqueous solution should contain from 0.3 to three per cent.of themixture, the quantities of salt always calculated This solution servesas electrolyte. The electrodes are of lead. Under the influence of theelectric current the lead of the anode is transformed into peroxid oflead, the hydrogen of the water decomposed by the process escapes, andthe oxygen enters into the peroxid of lead. The process goes oncontinually with the same electrolyte as both acids remain undecomposedby the action of the current and only the Water consumed by the processhas to be renewed.

Example; A dilute solution one and onehalf per cent. strong of a mixtureof 99.5 weight parts of sulfate of sodium and 0.5 weight parts ofchlorate of sodium forms the electrolyte. Therein the anodes andcathodes are suspended and an electric current passed through. Theintensity of this current should be fifty amperes, its density 0.5amperes'pro square decimeter, and its tension about three volts. Tofacilitate the reaction and to keep the electrolyte in motion, air iscarefully blown in during the process.

\Vhat I claim is The herein-described process of producing peroxid oflead by means of electrolysis consisting in using in connection with alead anode an aqueous solution as electrolyte containing from 0.3 tothree per cent. of the sodium, potassium or ammonium salts of sulfuricacid in mixture with the sodium, potassium or ammonium salts of chloricacid, and in passing a current through the said solution, substantiallyas described.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

CARL LUOKOW. Witnesses:

OTTO STREOKER, WILLIAM H. MADDEN.

